Reproductive performance of heifers of different weight classes in the first and second mating

Detalhes bibliográficos
Autor(a) principal: Pacheco, Rangel Fernandes
Data de Publicação: 2019
Outros Autores: Brondani, Ivan Luiz, Alves Filho, Dari Celestino, Cattelam, Jonatas, Mayer, Andrei Retamoso, Martini, Ana Paula Machado, Santos, Gilmar Cardoso dos, Borchate, Daniele, Restle, João
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Semina. Ciências Agrárias (Online)
Texto Completo: https://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/33328
Resumo: The objective of this study was to evaluate the effect of live weight at first mating on reproductive performance in the first and second reproductive years. For that purpose, the reproductive history of 221 heifers mated for the first time between the years of 2003 and 2012 was evaluated. Heifers were grouped into three weight classes at the age of 24 months: 50-59.9% (55%), 60-69.9% (65%), and 70-80% (75%). The pregnancy rate in the first reproductive year in heifers from weight classes 55%, 65%, and 75% was 38.0%, 56.4%, and 69.0%, respectively. The pregnancy rate in the second reproductive year was not affected by weight at first mating (p > 0.05) and corresponded to 41.6%; 42.1%, and 50.4% in the three weight classes, respectively. The weight class of heifers before mating at the age of 24 months affected reproductive performance at first mating but did not increase the pregnancy rate in the second reproductive year.
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spelling Reproductive performance of heifers of different weight classes in the first and second matingDesempenho reprodutivo de novilhas de distintas classes de peso no primeiro e segundo acasalamentoHeifer developmentDesired body weightFirst matingFirst calving.Desenvolvimento de novilhasPeso corporal desejadoPrimeiro acasalamentoPrimeiro parto.The objective of this study was to evaluate the effect of live weight at first mating on reproductive performance in the first and second reproductive years. For that purpose, the reproductive history of 221 heifers mated for the first time between the years of 2003 and 2012 was evaluated. Heifers were grouped into three weight classes at the age of 24 months: 50-59.9% (55%), 60-69.9% (65%), and 70-80% (75%). The pregnancy rate in the first reproductive year in heifers from weight classes 55%, 65%, and 75% was 38.0%, 56.4%, and 69.0%, respectively. The pregnancy rate in the second reproductive year was not affected by weight at first mating (p > 0.05) and corresponded to 41.6%; 42.1%, and 50.4% in the three weight classes, respectively. The weight class of heifers before mating at the age of 24 months affected reproductive performance at first mating but did not increase the pregnancy rate in the second reproductive year.Objetivou-se avaliar o efeito do peso vivo ao primeiro acasalamento de novilhas sobre o desempenho reprodutivo na primeira e segunda monta. Para isso, foi avaliado o histórico reprodutivo de 221 novilhas de corte acasaladas pela primeira vez entre os anos de 2003 até 2012. As novilhas foram agrupadas em três classes de peso vivo aos 24 meses de idade, sendo eles: entre 50 a 59,9% do peso adulto (55%); de 60 a 69,9% do peso adulto (65%) e entre 70 a 80% do peso adulto (75%). A taxa de prenhez no primeiro ano reprodutivo foi de 38,0%; 56,4% e 69,0% às acasaladas com faixa de peso de 55%, 65% e 75%; respectivamente. A taxa de prenhez no segundo ano reprodutivo não sofreu efeito da classe de peso ao primeiro acasalamento (p > 0,05) com valores de 41,6%; 42,1% e 50,4%. A classe de peso antes do acasalamento de novilhas aos dois anos de idade interfere no desempenho reprodutivo na primeira monta, mas não resulta em aumento na taxa de prenhez no segundo ano reprodutivo.UEL2019-04-15info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/3332810.5433/1679-0359.2019v40n2p819Semina: Ciências Agrárias; Vol. 40 No. 2 (2019); 819-830Semina: Ciências Agrárias; v. 40 n. 2 (2019); 819-8301679-03591676-546Xreponame:Semina. Ciências Agrárias (Online)instname:Universidade Estadual de Londrina (UEL)instacron:UELenghttps://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/33328/25266Copyright (c) 2019 Semina: Ciências Agráriashttp://creativecommons.org/licenses/by-nc/4.0info:eu-repo/semantics/openAccessPacheco, Rangel FernandesBrondani, Ivan LuizAlves Filho, Dari CelestinoCattelam, JonatasMayer, Andrei RetamosoMartini, Ana Paula MachadoSantos, Gilmar Cardoso dosBorchate, DanieleRestle, João2022-10-19T14:30:36Zoai:ojs.pkp.sfu.ca:article/33328Revistahttp://www.uel.br/revistas/uel/index.php/semagrariasPUBhttps://ojs.uel.br/revistas/uel/index.php/semagrarias/oaisemina.agrarias@uel.br1679-03591676-546Xopendoar:2022-10-19T14:30:36Semina. Ciências Agrárias (Online) - Universidade Estadual de Londrina (UEL)false
dc.title.none.fl_str_mv Reproductive performance of heifers of different weight classes in the first and second mating
Desempenho reprodutivo de novilhas de distintas classes de peso no primeiro e segundo acasalamento
title Reproductive performance of heifers of different weight classes in the first and second mating
spellingShingle Reproductive performance of heifers of different weight classes in the first and second mating
Pacheco, Rangel Fernandes
Heifer development
Desired body weight
First mating
First calving.
Desenvolvimento de novilhas
Peso corporal desejado
Primeiro acasalamento
Primeiro parto.
title_short Reproductive performance of heifers of different weight classes in the first and second mating
title_full Reproductive performance of heifers of different weight classes in the first and second mating
title_fullStr Reproductive performance of heifers of different weight classes in the first and second mating
title_full_unstemmed Reproductive performance of heifers of different weight classes in the first and second mating
title_sort Reproductive performance of heifers of different weight classes in the first and second mating
author Pacheco, Rangel Fernandes
author_facet Pacheco, Rangel Fernandes
Brondani, Ivan Luiz
Alves Filho, Dari Celestino
Cattelam, Jonatas
Mayer, Andrei Retamoso
Martini, Ana Paula Machado
Santos, Gilmar Cardoso dos
Borchate, Daniele
Restle, João
author_role author
author2 Brondani, Ivan Luiz
Alves Filho, Dari Celestino
Cattelam, Jonatas
Mayer, Andrei Retamoso
Martini, Ana Paula Machado
Santos, Gilmar Cardoso dos
Borchate, Daniele
Restle, João
author2_role author
author
author
author
author
author
author
author
dc.contributor.author.fl_str_mv Pacheco, Rangel Fernandes
Brondani, Ivan Luiz
Alves Filho, Dari Celestino
Cattelam, Jonatas
Mayer, Andrei Retamoso
Martini, Ana Paula Machado
Santos, Gilmar Cardoso dos
Borchate, Daniele
Restle, João
dc.subject.por.fl_str_mv Heifer development
Desired body weight
First mating
First calving.
Desenvolvimento de novilhas
Peso corporal desejado
Primeiro acasalamento
Primeiro parto.
topic Heifer development
Desired body weight
First mating
First calving.
Desenvolvimento de novilhas
Peso corporal desejado
Primeiro acasalamento
Primeiro parto.
description The objective of this study was to evaluate the effect of live weight at first mating on reproductive performance in the first and second reproductive years. For that purpose, the reproductive history of 221 heifers mated for the first time between the years of 2003 and 2012 was evaluated. Heifers were grouped into three weight classes at the age of 24 months: 50-59.9% (55%), 60-69.9% (65%), and 70-80% (75%). The pregnancy rate in the first reproductive year in heifers from weight classes 55%, 65%, and 75% was 38.0%, 56.4%, and 69.0%, respectively. The pregnancy rate in the second reproductive year was not affected by weight at first mating (p > 0.05) and corresponded to 41.6%; 42.1%, and 50.4% in the three weight classes, respectively. The weight class of heifers before mating at the age of 24 months affected reproductive performance at first mating but did not increase the pregnancy rate in the second reproductive year.
publishDate 2019
dc.date.none.fl_str_mv 2019-04-15
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv https://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/33328
10.5433/1679-0359.2019v40n2p819
url https://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/33328
identifier_str_mv 10.5433/1679-0359.2019v40n2p819
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv https://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/33328/25266
dc.rights.driver.fl_str_mv Copyright (c) 2019 Semina: Ciências Agrárias
http://creativecommons.org/licenses/by-nc/4.0
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Copyright (c) 2019 Semina: Ciências Agrárias
http://creativecommons.org/licenses/by-nc/4.0
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv UEL
publisher.none.fl_str_mv UEL
dc.source.none.fl_str_mv Semina: Ciências Agrárias; Vol. 40 No. 2 (2019); 819-830
Semina: Ciências Agrárias; v. 40 n. 2 (2019); 819-830
1679-0359
1676-546X
reponame:Semina. Ciências Agrárias (Online)
instname:Universidade Estadual de Londrina (UEL)
instacron:UEL
instname_str Universidade Estadual de Londrina (UEL)
instacron_str UEL
institution UEL
reponame_str Semina. Ciências Agrárias (Online)
collection Semina. Ciências Agrárias (Online)
repository.name.fl_str_mv Semina. Ciências Agrárias (Online) - Universidade Estadual de Londrina (UEL)
repository.mail.fl_str_mv semina.agrarias@uel.br
_version_ 1750315428192714752

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